Areas related to Circles ncert solutions Chapter 12 Exercise 12.1 Question 4
4. The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?
Solution:
Diameter of wheel = 80 cm
Radius of wheel=
cm
Distance traveled by car in 10 minutes = speed of car x time =
km
11 km = 11,000,00 cm
Circumference of circle =
cm
Therefore, 1 Revolution =
cm
1 cm =
revolutions
11,000,00 cm =
revolutions
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